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<p>[QUOTE=&quot;desertgem, post: 1974378, member: 15199&quot;]The sulfur ( sulfides)&nbsp; was part of the paper production ( Kraft process). Yes, portions of the chemical was lost over time, and some cardboard producers tried to limit the yellowing by using a finishing process which blocked some of the effect. Some people tried to enhance toning by searching for old paperback books ( dime novels which were printed on the cheapest paper) , and insert coins between the pages. This generally produces toning all over the coin whereas if the coin is in a window in older albums, the edges will tone more than the centers.[/QUOTE]</p><p><br /></p>

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